Here is the full list of all 60 Wildfire achievements.
Trap an enemy in vines, then set those vines on fire
Start New Game+
Complete Wildfire's story
Trap an enemy in a bubble
Unlock every cell door on City 4: Tower Prison
Cremate an enemy on City 2: Crematorium
Burn every building on City 1: Trade District
Let Rigel protect you from an enemy on Mountains 7: Bobcat Pits
Return all five crucibles to their pedestal on Mountains 5: Medo Subpeak
Keep three bobcats at bay with one fireball on Mountains 4: Fenn Plateau
Pick up a bobcat to mask your scent on Mountains 2: Felidae Crevice
Melt at least 90% of the snow on Mountains 1: Ambia Moraine
Learn to embrace earth
Lure the demon to the explosive barrels on Caves 7: Sulphur Mines
Destroy all sulphur crystal deposits on Caves 6: Osmo Aven
Place three enemies in coffins on Caves 5: Nerii Tomb
Make an archer accidentally shoot another enemy
Cause an enemy to fall to their death by surprising them
Cause an enemy attack to free a captive villager
Overhear an argument on Caves 2: Lubri Grotto
Extinguish all fires on Caves 1: Bama Passage
Beat the fuse to the demolition site on Forest 7: Mouth of Uahm
Land on an enemy from high enough to knock them out
Learn to embrace water
Escort every villager to safety on Forest 6: Dubra Trench
Don't get wet on Forest 5: Navia Basin
Throw a villager into his own box of oranges
Ensure Ezra is never detected on Forest 4: Mendo Levee
Burn at least 90% of the vegetation on Forest 3: Kumba Gorge
Overhear an argument on Forest 2: Brevis Pass
Make two soldiers panic on Forest 1: Iria Plain
Learn to embrace fire
Only use water on Caves 3: Obre Cavern
Never get burnt on Caves 4: Deira Falls
Read all expedition diaries on Mountains 3: Carnota Rise
Only embrace earth on Mountains 6: Vindius Ridge
Infiltrate via the roof before any other entrance on City 3: Chateau Caira
Complete Wildfire's story in co-op
Complete New Game+
Rescue all 40 villagers
Complete the Undetected challenge on every level
Complete the No Kills challenge on every level
Complete the No Save Reloads challenge on every level
Complete the Speedrun challenge on every level
Unlock at least 1 stage of every ability
Fully upgrade all fire, water, and earth abilities
Collect all meteor shards
Pickpocket all Kickstarter lockets
Get captured, then escape from prison
Set fire to everything flammable in Captain Caira's Chateau
Heal Captain Caira's burns with Rejuvenate
Bring a dead enemy back to life with Rejuvenate
Bring a co-op player back to life with Rejuvenate
Survive a fall to your death by carrying Rejuvenating water
Crush an enemy with a gate
Grow a vine by sending earth upward in a bubble
Block an arrow with a body
Make an enemy panic with a flaming chicken
Smoke Ride up the smoke plume created by destroyed sulphur crystals
Transplant while carrying a villager